Window shade



H. ZINSER WINDOW SHADE Dec. 11 1923.

Filed Sept. 20. 1921 Patented Dec. 11, 1923.

UNITED STATES PATENT OFFICE.

HEIN'RY ZINSER, OF NEW YORK, N. Y.

WINDOW SHADE.

Application filed September 20, 1921. SerialNo. 501,995.

The present invention relates to window shades of the type wherein the shade is secured to a roller, having a spring that rolls up the shade when a detent is thrown back by a slight downward jerk.

One of the difficulties experienced with window-shades of the type mentioned is that the shade proper is torn ofl the roller when unwound too far. Numerous attempts have been made to overcome this diffioulty, but, as far as known, the means for preventing the tearing oil the roller from the shade are too complicated and also unreliable in their operation.

The main object of the present invention is to provide a simple and efiicient attachment for window-shades which overcomes the difiiculty above referred to.

Another object of the invention is to provide a window-shade of the character stated which is capable of manufacture on a commercial scale, or in other words one which is not so difiicult to make as to be beyond the reasonable cost of such a contrivance.

With these and other objects in View,

which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claim and illustrated in the accompanying drawin gs, it being understood that many changes may be made in the size and proportion of the several parts and details of construction within the scope of the appended claim, without departing from the spirit or sacrificing any of the advantages of the invention.

One of the many possible embodiments of the invention is illustrated in the accompanying drawings, in which Figure 1 is a perspective View of a win dow frame with a window-shade constructed in accordance with the present invention in position thereon; Fig. 2 is a section. on a larger scale, taken on line 2-2 of Fig. 1 through the shade roller andshade only; Fig. 3 is a section taken on line 3- -3 of Fig. 2; and Fig. 4 is a section taken on lineHofFig. 2.

In the drawings, the numeral 10 indicates a window frame, to which are secured in any suitable manner brackets 11, in the latter being mounted in the usual way a roller 12. To this roller is fastened by tacks 13, or otherwise, a shade 14.. Thus tar, the construction and operation of the elements are well known, so that a further detalled description of the same seems to be unnecessary.

Adjacent-the upper end of the shade issecured to the latter in any suit-able manner a plurality of spaced resilient bands 15, for instance rubber bands. These bands are also fixed, for instance by staples 16, to the roller 12. When the shade 14 is nearly unwound from the roller 12, the shade and the rubber bands diverge, as clearly shown in Fig. 2 of the drawings, the bands 15 being shorter in their normal unstretched state than the distance measured on the shade between the point of attachment of the shade to the roller and the point of attachment of the bands 15 to the shade. The operation of this-deviceis as follows: When the shade 14: is nearly unwound from the roller 12, (Fig. 2), the resilient. bands 15 are drawn taut and thereafter stretched, thereby preventing a further unwinding movement of the roller 12 and thus a detaching of the shade from the roller.

The resilient bands may be of any suitable configuration, their number varying according to the requirements. It is possible to substitute a single web of considerable width for the plurality of rubber bands shown in the drawings.

In the ordinary window-shades heretofore in use, when the shade is entirely unwound, by accident or otherwise, from the roller, it cannot be rewound without the operator taking hold of the roller proper and starting the rewinding of the shade. This defect of the rollers heretofore in use is due to the fact that the detent controlling the spring of the roller cannot be thrown back, after the shade has been entirely unwound, by pulling on the shade. With the device herein described this is not the case, as, no matter how far the shade has been unwound, the resilient bands 15 always permit the detent to be thrown back by a s1 ght downward jerk, thereby permitting the spring to roll up the shade.

What I claim is A window shade comprising a roller, a shade fastened thereto, and flexible bands attached to said shade and roller, the length of each band in its normal unstretched state being shorter when the shade is nearly unwound from the roller than the distance measured on the shade between the point of attachment of the shade to the roller and the point of attachment of said band to said shade, each band being attached to the said shade intermediate its ends and the loose portion of each band extending toward said shade, the points of attachment ofsaid bands to said roller and the points of attachment of said shade to said roller being spaced apart and the points of attachment of said bands to said roller being disposed below the points of attachment of said shade to said roller when the shade is nearly unwound from the said roller.

Signed at New York, in the county of Queens and'State of New Y0rk, this 9th day of September, A. D. 1921.

HENRY ZINSER. 

